pSS	primary Sjögren’s syndrome
RA	rheumatoid arthritis
SLE	systemic lupus erythematosus
HNE	4-Hydroxy-2-nonenal
1-D SDS-PAGE	one-dimensional sodium dodecyl sulfate polyacrylamide gel electrophoresis
nano-LC–MS/MS	nano-liquid chromatography–tandem mass spectrometry
HC	healthy control
Ig	immunoglobulin
ACR	American College of Rheumatology
IP	immunoprecipitation
A1AG1	α-1-acid glycoprotein 1
RSD	relative standard deviation
SD	standard deviation
ROC	receiver operating characteristic
AUC	area under the ROC curve
CBB	Coomassie brilliant blue
RF	rheumatoid factor
ANA	antinuclear antibody
anti-Ro (SSA)	anti-Sjögren’s-syndrome-related antigen A
anti-La (SSB)	anti-Sjögren’s-syndrome-related antigen B
CRP	C-Reactive protein
ESR	erythrocyte sedimentation rate
OR	odds ratio
ESSDAI	EULAR Sjögren’s syndrome disease activity index
NSAIDs	nonsteroidal anti-inflammatory drugs
DMARDs	Disease-modifying anti-rheumatic drugs
DMARDs	Disease-modifying anti-rheumatic drugs